Barton Marine Drain Plug and Socket - 15mm (.60") Bore - Black Free shipping for all orders over $50.00. 30 days returns. Sign up for great deals with Fishbrain Pro. Share Loading Facebook Like button... Barton Marine Drain Plug and Socket - 15mm (.60") Bore - Black Free shipping for all orders over $50.00. 30 days returns. Sign up for great deals with Fishbrain Pro. Share Loading Facebook Like button...